Brake



Sept., 8, 1931., v BENDlx ,822,687

BRAKE Filed Deo. 3. 1927 INVENTOR ViNcBgT Bmw ATTORNEY Patented Sept. 19131 UNITED STATES TNT OFFICE VINCENT BENDI XOF CHICAGO', ILLINOIS, ASISIGNOR TO BENDIX BRAKE COMPANY, 0F

. r vSOUTH BEND, INDIANA, A. CORPORATION 0F ILLINOIS BRAKE Application` :tiled December 3, 1927. Serial No. 237,386.

This invention relates to brakes, and is illustrated as embodied in an internalexpand- 4ing automobilebrake. e

An object of the invention is to arrange the brake so thatl there are no projecting parts to interfere with adjacent portions of the chassis, or to be bent or damagedby engagement therewith. Preferably theanchor, and

the shoe-positioning means, which comprise the usualprojecting parts ofthe brake,jare arranged entirely within the brake drum, the backing plate beingpress'ed or drawn to form `bosses projecting lnto the drum and carrying the anchor and -the shoe-positioning means. When regarded from the( exterior of the backing plate, these bosses form depressions in which are arranged the clamping nuts, or equivalent parts, of the anchor and. of the shoe-positioning means. Thus all` of these parts terminate short of the l'plane of.

' the backing late, leaving the exterior yof the brake entirely clear of projecting parts.

i The above and other objects and features" of the invention, including various novel and Adesirable details of construction, will be apparent from the following descril'itionv ofone illustrative embodiment' shown inthe accomf panying drawings, in which brake, just inside the head of the brake drum, and showing the brake shoes in side elevation; Figure 2 is apartial section, through the applying means-of the brake, on the line'2-2 of Figure 1;

Figure' 3 is a partial section through Athe brzke anchor, on vthe line 3-3 of Figure l; an

Figure 4 is a partial section through the shoe-positioning means, on the line 4 4 of Figure 1.

In the arrangement selected .for illustration, the brake includes a drum 10, attheopen side of which is a support such as a backin plate 12, andrwithin which is arranged t e brake friction means, shown as comprising three lhralre shoes 14, 16, and 18. Shoes 16 and 18 are anchored on a fixed pivot 20, while shoe 14 is connected to'shoe 16 by a floating pivot 22. The shoes 14 and 18 are spread apart to apply the brake,

Flgure 1 1s a vertical sectionthrough the.

with a shaft 32 j ournaled in bearings formed iin two plates 34 heldspaced apart'by posts 36. In order to permit the cam to shift tov center itself, posts 36 pass through relatively large openmgs 38 vinthe backing plate 12 and are provided with coil springs 40 sleeved l on the posts and confined between the inner plate 34 and friction washers 42.

Anchor -20 is formed witha 4collar 44, cooperating with a nut 46 threaded on a reduced-diameter portion ofthe anchor .to hold the shoes, and which also co-operates with a nut 48 threaded on the other end of the anchor to secure the anchor to the backing plate 12. According to an important feature of the invention, backing plate 12 vis drawn inwardly of the drumtto form lwhat may be regarded as a boss" 50 projecting 'intothe drum andcarrying the anchor 20, thus maklng the overhane` ofthe anchor as short as vposslhle. .Regar ing the outside of the backing plat-athis "construction maybe regarded as providing a depressiony for nut 48 and for the end of anchor 20 which projects through the plate, so thatthe entire anchor is within the drum,-i. e., no part of'itprojects past j the plane of thebacking plate.

- A similar boss or depression 52 is drawn in the plate adjacent the floating pivot 22, to receive certain parts of novel shoe-positioning means fully disclosed in an application filed es e by Adiel Y. Dodge, October 4, 1926, Serial No.. 139,389. This means included a clamping bolt 54 passing through the backing plate into the depression 52, and passing through a slot 5 6 in a positioning plate 58 and 'frictionally clamping the plate 58 tothe backing plate l2. Plate 58 has an opening at'its otherend to,` receive the end of pivot 22, beine' confined between a collar 60 on the pivot and a cotterpin 62 in the end of the pivot, this opening being larger than pivotf22 by an amount equal m0 to the distance the pivot should move 'durlng the movementof shoe 16 from applied to re` leased position.

When the brake is applied, pivot 22 moves in the opening in plate 58 and, if the brake has worn, it may shift the plate 58 slightly against the resistance of bolt 54. lVhen the pivot-passes, and with another washer 68 held against the end of bushing 66 by av nut '70' threaded on the end of the pivot. The ends of shoes 14 and 16, to which washers 72 are shown welded to increase the bearing surface, are sleeved on the bushing 66, which is shown with a large-diameter portion on which shoe-14 is pivoted and with a smallerdiameter portion on which shoe 16 is pivoted.

While one illustrative embodiment has beendescribed in detail, it iis not my intention to limit the' scope of the invention to that particular embodiment or otherwise than by the terms of the appended claims.

I claim:

1. A brake comprising, in combination, a drum, friction means within the drum, an

anchor for the friction meansand a backing plate at the open side of the drum having a boss projecting within the drum and carrying said anchor and Ydefining a depression on ing part in said depression and lterminating short of the plane of the backing plate.

5. A brake having, in combination withl an operating shaft a support having openings on opposite sides of the shaft, a pair of plates in which the shaft is j ournalled and which are on opposite sides of the support and the outer one of which rests against the support, .posts fixedly spacing the plates apart and which pass through said openings, friction washers on the posts engaging the face of the support opposite the outer plate, and coil springs sleeved on the posts and confined between the washers andthe inner plate.

In testimony whereof, I have hereunto signed my name.

VINCENT BENDIX.

the exterior of the backing plate and being of such a depth that the anchor is arranged entirely within the drum.

2. A brake comprising, in combination, a drum, friction means within the drum, 'an anchor for the friction means, and a `backing plate at Ithe open side of the drum having a boss projecting Within the drum and carrying said anchor and defining a 'depression on the exterior of the backing plate, the anchor having a part projecting through said boss into the depression and having a clamping part in said depression and terminating short of the plane of the backing plate.

3. A brake comprising, in combination, a

drum, friction means within the drum, a`

positionino device for the friction means, and a bacingl plate at the open side of the drum having a boss projecting within the drum and carrying said device and defining a depression on the exterior of the backing plate and being of such a depth that said device is arranged entirely Withinthe drum.

4. A brake comprising, in combination, a drum, friction means Within the drum, a positioning device for the friction means, and a backing plate at the open side of the drum having a boss projecting Within the drum and carrying said device and defining a depression on the exterior of the backing plate, said device having a part projecting through said boss into the depression and having a clamp- 

